Malicious PDF — malware analysis report

Static analysis result for SHA-256 7efd07cd85a6901c…

MALICIOUS

PDF

70.9 KB Created: 2021-09-18 14:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40a8f32abb46844af646a70b79e5eb2a SHA-1: db7e506f7e9a5c8c34d7ab977ed72aed6d4f7760 SHA-256: 7efd07cd85a6901c0388cacb5ed19652be45d906d15bc9596e0506c02c2cdc8a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the overall structure suggest an attempt to redirect users to malicious content, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://hatdesechia.com/storage/ckfinder/files/18759384918.pdf
    • http://thewellmanteam.com/userfiles/files/50814894016.pdf
    • http://kuryakyn.ru/userfiles/file/62392303123.pdf
    • http://asupuro.com/user_data/image/file/40913438557.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/v1o4ag1fafls90bcglkqui06j4/10379453536.pdf
    • http://jamalcar.com/userfiles/file/didasej.pdf
    • https://graphicart.ro/fckfiles/file/vodefajikamizuj.pdf
    • https://zibarajabi.com/cache/fck_files/file/rewolanizurixud.pdf
    • https://havilahbuilders.com/userfiles/file/56290560712.pdf
    • http://taiwangallant.com/uploads/files/202109031425208688.pdf
    • https://laplacedesstores.com/upload/file/xavibiwutulixiwuko.pdf
    • https://srldirect.com/ckfinder/userfiles/files/zufivetewosadezezixori.pdf
    • http://htwy.com/upload/file/25078683486.pdf
    • http://maiodi.com/userfiles/files/terujosolemamumiduposu.pdf
    • http://rqconsultores.com/userfiles/file/puruxoxevijiwixowivu.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcc670069a---sididu.pdf
    • https://thepainter.asia/upload/files/zilusu.pdf
    • https://matkinhantai.com/luutru/files/2117609077.pdf
    • https://adurucui.com/ckfinder/files/tasavopudagefuvama.pdf
    • http://angel-conference.org/upload_fck/file/2021-9-16/20210916145225920186.pdf
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23788085418.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/5cf21393064b4e2630fbf20cca7aca53/12821172076.pdf
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/2892406362.pdf
    • https://investmentskillsgroup.com/images/userfiles/file/99592540367.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=download+games+for+androids+for+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6f8.bin
dd657daa1069175cc76b0c990008b419411c59e36c6911f640c7e5babe589ca7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F8 15132 bytes
font_01_sfnt_off0000dd6a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6A 16792 bytes
font_02_sfnt_off0000f581.bin
05ea09fcabb380d9e53bba0095bad3cf7a9bd6560bc8a90919b3311d110a6237		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF581 10688 bytes

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